CN2914100Y - Monolithic voltage detector of fuel battery group - Google Patents

Abstract

The utility model relates to a detection device for fuel cell stack single chip voltage, including a detection plate, a CAN network controller, a keyboard, a liquid crystal display unit and a USB storage unit. The utility model is characterized in that: the monocells in the fuel cell stack are connected with the outputs of all detection plates; the detection plate CAN sub-network is composed of a plurality of detection plates by CAN bus; CAN network controller is in twin CAN structure, wherein, one aspect is connected with the detection plate CAN network and the other aspect is connected with the outer CAN network. The two CAN networks are independent with each other and constitute network topology. The keyboard, liquid crystal display unit and USB storage unit are connected with the CAN network controller respectively. The CAN network is also provided with RS-232 and RS-485 interface and could be connected with PC or other equipments by RS-232, RS-485 or CAN interface. The whole detection device has the advantages of concise and clear circuit, high reliability, lower cost, good expansibility and high precision detection of fuel cell stack single chip voltage.

Description

A kind of fuel cell pack monolithic voltage pick-up unit

Technical field

The utility model belongs to each monomer voltage pick-up unit of a kind of series connection power supply, particularly a kind of fuel cell pack monolithic voltage pick-up unit.

Background technology

Fuel cell is the device that a kind of chemical energy with fuel is converted into electric energy, and fuel cell pack is composed in series to hundreds of sheet monocell by tens usually.Because the cascaded structure of monolithic battery in the pile, in the fuel cell stack operation process, the performance and the safety that can influence whole stack unusually of monolithic battery, need to detect in real time each monolithic battery voltage, show the storage voltage data, and voltage data passed to the fuel battery engines master controller, safeguard the security of operation of pile; Or voltage data passed to PC, be convenient to the analyze and research performance of battery pile of scientific research personnel.Because fuel cell pack is to be composed in series by the multi-disc monolithic battery, there is the problem of accumulation electromotive force in monomer voltage measuring.At present, all there is certain deficiency in fuel cell monolithic voltage pick-up unit, as: adopt the method requirement of PHOTOMOS photoelectric isolating relay all to want a PHOTOMOS photoelectric isolating relay in each road at least, and microcontroller MCU will have a large amount of I/O mouths or extend out code translator and makes the relay gating and switch, the system cost height, complex structure; Adopt the method for electric resistance partial pressure and multiway analog switch can make measuring accuracy not reach requirement, and a large amount of divider resistances can influence the performance of pile.

Summary of the invention

Fundamental purpose of the present utility model is to adopt more simple and reliable circuit, to improve the accuracy and the reliability of fuel cell monomer voltage measuring, provides a kind of fuel cell pack monolithic voltage pick-up unit, to overcome above-mentioned deficiency.

To achieve these goals, the technical solution adopted in the utility model is:

This fuel cell pack monolithic voltage pick-up unit comprises a plurality of check-out consoles, CAN (control area net) network controller, keyboard and liquid crystal display, USB storage unit.Be characterized in: a plurality of monolithic batteries in the fuel cell pack are connected with a check-out console input end, all monolithic battery is connected with a plurality of check-out console input ends, a plurality of check-out consoles constitute check-out console CAN sub-network by the CAN1 bus, the CAN network controller is two CAN structures, one side is connected with check-out console CAN1 network, the opposing party is connected with outside CAN2 network, and two CAN networks are independently of one another, constitutes network topology structure.Keyboard and liquid crystal display, USB storage unit are connected with the CAN network controller respectively, and the CAN network controller also has RS-232 and RS-485 interface, are connected with PC or miscellaneous equipment by RS-232, RS-485 or CAN interface.

Above-mentioned check-out console is by the calculus of differences circuit, the A/D change-over circuit, photoelectric isolating circuit, microcontroller MCU, toggle switch, the CAN telecommunication circuit is formed, wherein each monocell two ends of fuel cell pack directly are connected with the calculus of differences circuit respectively, some calculus of differences circuit are divided into one group, power supply is isolated from each other between each group, the calculus of differences circuit output end is connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with microcontroller MCU, microcontroller MCU is connected with the CAN telecommunication circuit, the CAN telecommunication circuit is connected with check-out console CAN1 network, has a toggle switch to be connected with the I/O mouth of microcontroller MCU.

Calculus of differences circuit in the above-mentioned check-out console is the precision operational-amplifier that is made of four high guaily unit, the amplitude limit output protection circuit that output terminal has current-limiting resistance R and stabilivolt Dz to constitute.

A/D conversion chip in the A/D change-over circuit in the above-mentioned check-out console is a hyperchannel modulus conversion chip, between microcontroller MCU and peripheral A/D change-over circuit and the CAN telecommunication circuit photoelectric isolating circuit is arranged in the check-out console, microcontroller MCU and peripheral circuit are realized the photoelectricity isolation.

Microcontroller MCU in the above-mentioned check-out console constitutes check-out console CAN sub-network, ID number of setting each check-out console by toggle switch by CAN bus and other each check-out console.

The beneficial effects of the utility model are with simple and reliable circuit, and according to survey monolithic number, the number of increase and decrease check-out console can be finished the accurate detection of whole stack monolithic voltage.Compared with the prior art, the utility model is simple in structure, reliability is high, cost is low, element is few, degree of accuracy is high, also can not influence the performance of pile in measurement.

Description of drawings

Fig. 1 is a structured flowchart of the present utility model.

Fig. 2 is the theory diagram of check-out console of the present utility model.

Fig. 3 is the accurate calculus of differences circuit theory diagrams that four high guaily unit of the present utility model constitutes.

Fig. 4 be A/D change-over circuit of the present utility model and with microcontroller MCU interface circuit theory diagram.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further details.

Figure 1 shows that the structured flowchart of fuel cell pack monolithic voltage pick-up unit.It comprises check-out console, CAN network controller, keyboard and liquid crystal display, USB storage unit.Fuel cell pack is connected with each check-out console input end, a plurality of check-out consoles constitute check-out console CAN sub-network by the CAN1 bus, the CAN network controller is two CAN structures, one side is connected with check-out console CAN1 network, the opposing party is connected with outside CAN2 network, two CAN networks are independently of one another, constitute network topology structure.Keyboard and liquid crystal display, USB storage unit are connected with the CAN network controller respectively.The CAN network controller also has RS-232 and RS-485 interface, can pass through RS-232, RS-485 or the CAN interface is connected with PC or miscellaneous equipment.

Fig. 2 is the theory diagram of check-out console.Check-out console is made up of calculus of differences circuit, A/D change-over circuit, photoelectric isolating circuit, microcontroller MCU, toggle switch, CAN telecommunication circuit.It is characterized in that: each monocell two ends of fuel cell pack directly are connected with the calculus of differences circuit respectively, by the size of monolithic voltage cumulative maximum electromotive force and the amplifier chip withstand voltage requirement of calculus of differences circuit, some calculus of differences circuit are divided into one group, and power supply is isolated from each other between each group.The calculus of differences circuit output end is connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with the photoelectric isolating circuit input end, the photoelectric isolating circuit output terminal is connected with microcontroller MCU, microcontroller MCU isolates through photoelectricity and is connected with the CAN telecommunication circuit, the CAN telecommunication circuit is connected with check-out console CAN network, and toggle switch is connected with the I/O mouth of microcontroller MCU.

The accurate differential operational amplifier circuit that Fig. 3 constitutes for four high guaily unit.The voltage at each series-connected cell two ends obtains differential voltage through the calculus of differences circuit, i.e. monolithic battery voltage.Fuel cell monolithic voltage signal is the differential mode small-signal, and contains bigger common mode part, and its numerical value is sometimes much larger than difference mode signal.Therefore, require amplifier should have the ability of stronger inhibition common-mode signal.Can select for use Difference Sets to become instrument amplifier, consider that each monolithic battery all will be equipped with an integrated instrument amplifier of difference, system cost height, the utility model adopt four general amplifiers to constitute accurate calculus of differences amplifying circuit.As shown in Figure 3, circuit is made up of A, B, four amplifiers of C, D and resistance R 1, R2, R3, R4, R5, R6, R7, R8 and stabilivolt Dz.

Make R1=R3 among the figure, R4=R5, R6=R7.

$\mathrm{Ui}1-\mathrm{Ui}2=\frac{R2}{2R1+R2}(\mathrm{Uo}1-\mathrm{Uo}2)$

Promptly $\mathrm{Uo}1-\mathrm{Uo}2=(1+\frac{2R1}{R2})(\mathrm{Ui}1-\mathrm{Ui}2)$

So output voltage

$\mathrm{Uo}4=\mathrm{Uo}3=-\frac{R6}{R4}(\mathrm{Uo}1-\mathrm{Uo}2)=-\frac{R6}{R4}(1+\frac{2R1}{R2})(\mathrm{Ui}1-\mathrm{Ui}2)$

If Uid=Ui2-Ui1, then

$\mathrm{Uo}4=\frac{R6}{R4}(1+\frac{2R1}{R2})\mathrm{Uid}$

When Ui1=Ui2, output voltage U o4=0.As seen circuit amplifies difference mode signal, suppresses common-mode signal.When containing common-mode noise in the input signal, also will be suppressed.

The output terminal of amplifier D is the amplitude limit output protection circuit, is made up of current-limiting resistance R8 and stabilivolt Dz, and it has limited the output current of amplifier on the one hand, has also limited output voltage amplitude on the other hand, makes amplifier output voltage clamper in+V _DzAnd between-the 0.7V, the safety of protection A/D ALT-CH alternate channel and subsequent device is in order to avoid damage circuit.

This circuit has the advantage of high input resistance, low output resistance, high cmrr.

Fig. 4 be the A/D change-over circuit and with microcontroller MCU interface circuit theory diagram.The utility model adopts the A/D converter of 12 bit resolutions that have 16 analog channels, and chip internal has reference circuit, has short, advantage of high precision switching time.Check-out console of the present utility model adopts wherein 15 analog channels, and the voltage signal of calculus of differences circuit output is delivered to 15 passages of A/D converter respectively, and the A/D transformation result is exported to microcontroller MCU.Communicate by letter by the SPI mode between A/D converter and the microcontroller MCU, realize that with optocoupler TLP113 photoelectricity is isolated between A/D change-over circuit and the microcontroller MCU, the power supply isolation realizes with DC/DC, the power supply that makes the power supply of microcontroller MCU and A/D converter is not each other not altogether, microcontroller MCU and peripheral components are isolated, avoid external noise to disturb, guarantee check-out console stable operation.

The whole detection device circuit is succinct, clear, the reliability height, and cost is lower, and extensibility is strong, can realize the high Precision Detection to the fuel cell pack monolithic voltage.

Should illustrate that at last enforcement of the present utility model only is used to technical scheme is described and is unrestricted.More than the utility model is had been described in detail, those of ordinary skill also is appreciated that and it still can make amendment or be equal to replacement the technical scheme that the utility model disclosed.And all do not break away from the modification and the replacement of the spirit and scope of technical solutions of the utility model, and it all should be encompassed in the middle of the claim scope of the present utility model.

The content that is not described in detail in this instructions belongs to this area professional and technical personnel's known prior art.

Claims (4)

1, a kind of fuel cell pack monolithic voltage pick-up unit, it comprises a plurality of check-out consoles, CAN network controller, keyboard and liquid crystal display, USB storage unit; It is characterized in that: a plurality of monolithic batteries in the fuel cell pack are connected with a check-out console input end, all monolithic battery is connected with a plurality of check-out console input ends, a plurality of check-out consoles constitute check-out console CAN sub-network by the CAN1 bus, the CAN network controller is two CAN structures, one side is connected with check-out console CAN1 network, the opposing party is connected with outside CAN2 network, two CAN networks are independently of one another, constitute network topology structure, keyboard and liquid crystal display, the USB storage unit is connected with the CAN network controller respectively, the CAN network controller also has RS-232 and RS-485 interface, passes through RS-232, RS-485 or CAN interface are connected with PC or miscellaneous equipment.

2, fuel cell pack monolithic voltage pick-up unit as claimed in claim 1, it is characterized in that: check-out console is by the calculus of differences circuit, the A/D change-over circuit, microcontroller MCU, toggle switch, the CAN telecommunication circuit is formed, wherein each monocell two ends of fuel cell pack directly are connected with the calculus of differences circuit respectively, some calculus of differences circuit are divided into one group, power supply is isolated from each other between each group, the calculus of differences circuit output end is connected with A/D change-over circuit input end, A/D change-over circuit output terminal is connected with microcontroller MCU, microcontroller MCU is connected with the CAN telecommunication circuit, the CAN telecommunication circuit is connected with check-out console CAN1 network, and toggle switch is connected with the I/O mouth of microcontroller MCU.

3, fuel cell pack monolithic voltage pick-up unit as claimed in claim 1 or 2; it is characterized in that: the calculus of differences circuit in the check-out console is the precision operational-amplifier that is made of four high guaily unit, the amplitude limit output protection circuit that output terminal has current-limiting resistance R and stabilivolt Dz to constitute.

4, fuel cell pack monolithic voltage pick-up unit as claimed in claim 1 or 2, it is characterized in that: the A/D conversion chip in the A/D change-over circuit in the check-out console is a hyperchannel modulus conversion chip, between microcontroller MCU and peripheral A/D change-over circuit and the CAN telecommunication circuit photoelectric isolating circuit is arranged in the check-out console, microcontroller MCU and peripheral circuit have photoelectric isolating circuit.

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